Friction-clutch



(No Model.) Z'Sheets-Sheet 1. C. M. GARHART. EMOTION CLUTCH.

No. 445,496. Patented Jan. 27, 1.891.

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(No Model.) 2 Sheets-Sheet 2.

G. M. GARHART.

FRIGTION CLUTCH. No. 445,496. Patented Jan. 27, 1891.

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Nite rares CLARENCE M. CARHART, OF PLAINFIELD, NF/V JERSEY.

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SPECIFICATION forming part of Letters Patent No. 445,496, dated anuary2'?, 1891.

Application filed October 16. 1890. Serial No. 368,254. (No model.)

i of Plainfield, in the county of Union and State of New Jersey, haveinvented a new and useful Improvement in Friction Clutches, of which thefollowing is a full, clear, and exact description.

Myinvention relates to an iinprovementin friction-clutches, and has forits object to simplify the construction of such devices and provide adevice especially adapted for use in connection with pulleys and a meanswhereby a pulley may be expeditiously and effectively connected with anddisconnected from a shaft, as may be desired.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a partofthis specification, in which similar figures and letters 0f referenceindicate corresponding parts in all the views.

Figure 1 is a central longitudinal section through the device connectedwith a pulley, illustrating the pulley as connected with a shaft. Fig. 2is a similar view, the pulley being illustrated as disconnected from theshaft. Fig. 3 is a transverse section through the shaft and a portion ofthe clutch, the section being taken on the line 3 3 of Fig. 1; and Fig.fi is a plan view of one of the collars forming a portion of the device.

Upon the shaft 10 a sleeve 11 is mounted, which is attached to the saidshaft by means of set-screws 12 or equivalent devices. One end of thesleeve is exteriorly threaded, as illustrated at a in Figs. 1 and 2, andnear the other end two diametrically-opposite lugs 13 are located, whichlugs are preferably integral with the sleeve, and their upper edges areordinarily cylindrical, as illustrated.

Upon the sleeve 11 at the back of the lugs 13 the hub 1i of apulleyAisloosely mounted, the said hub being provided with an annular centrali'lange l5. The flange 15 of the hub is made to engage with two collars16 and 17, one collar being located at each side of the flange, as shownin Figs. 1 and 2. Both of the collars are enlarged at their inner endsand provided, preferably, with fiat faces d', which flat faces engagewith the hub-{iange 15. The outer end of the collar 16 is provided withan internalrib 1S,which is longitudinally grooved to receive pins 19,which pins are inserted in the sleeve 11 near its threaded end, the saidpins, in conjunction with the lugs 13, being adapted to connect thecollar 16 with the sleeve. The collar 16 is adjustable toward the flange15 of the pulley-hub to compensate for any wear of its face o by meansof an adjusting-nut 20, screwed upon the threaded extremity of thesleeve. The collar 17 is provided at its outerend withdialnetrically-opposite recesses 21, as shown in Figs. 1, 2, and 4,which recesses are adapted to receive the lugs 13 of the sleeve. Back ofthe recesses 21 inthe collar 17 spaced ears 22 are provided, and betweeneach pair of ears the inner end of a link 24 is pivoted, the outer endsof which links are preferably forked. The under edge of the upper linkand the upper edge of thelower link, from apoint near their centers totheir pivotal extremities, are re-enforeed or thickened, as illustratedat b, and in the re-enforced edges of the links recesses 25 areproduced, which recesses are immediately over the lugs 13 of the sleeve.The recesses 25 are preferably somewhat Ushapedgbut the inner wall b ofthe recesses is given a cani-face, as the wall is formed upon the are ofa circle, the circle being struck from a point eccentric with the centerof the pivot of the links, as is indicated by the arrows. The cani-facesZJ of the links 24: are adapted to engage with the cylindrical outeredges and rear faces of the sleeve-lugs 13, and the action of the links24 is such that they may properly be called cam-levers.-

A shift-ing device B, of any suitable or approved construction, is heldto slide upon the shaft 10, and the said shifting device is pivotallyconnected with the links or levers 2a by means of links 26, whereby atoggle-connection between the shifting device and the collar 17 iseffected The sleeve 11 is usually provided with a longitudinaloil-chamber 27, having an inlet at one end stopped by a suitable plug orcap and an outlet at the opposite end, whereby the oil is fed betweenthe inner surface of the pulley-hub and the exterior surface of thesleeve.

In operation, when the shifting device Bis IOO , sentially horizontal.

carried in the direction of the pulley, the links 26 are' verticalandthe links or levers 24 es- In carrying the links or levers 2i totheirhorizontal positions they are carried outward from the sleeve, andthe inner ends of the'cam-faces only engage with thek back of thesleeve-lugs 13. When the links or levers 21 are in thehorizontalposition,'the collars 17 are forced against the hub-flange 15 and thesaid flange is tightly gripped by both of the collars 16 and 17, as whenthe collar 17 en gages with the hub-ange it forces it against the collar1G.. XVhen the parts are in the position just described, and shown inFig. 1, the pulley is connected with the shaft through the medium of thepins 19 and both the shaft andv pulley revolve together. When theshifting device B is carried away from the pulley, the links or levers:24 are drawn inward toward the sleeve, as the links 26 are carriedoutward, and as the links or levers 24 are drawn inward the recesses 25therein receive the lugs 13 of the sleeve, and the walls of the recessesopposite the cam e faces b', by engagement with said lugs, draw thecollar 17 away from the hub-ange, and the pulley is thereby free to turnindependently ot the shaft, as there is ample space for it to shift inthe direction of the shift-in g device between the pins 19 and thebottom of the lugs 13, and in so shifting the pulley moves away from thecollar 1G. It is evident that when the shifting device is moved inward,causing the links or levers 24 to be carried outward, the calnsurfaces bof said links or levers riding upon the lugs 13 will force the collar 17inward a sufficient distance to bind the ange 15 of the pulley-hubbetween it and the opposite collar 16.

Hav-ing thus described my invention, I claim. asnew and desire to secureby Letters Patent- 1'. The combiuatiomwitli a pulley having ahub-flange, a clamping-collar engaging the hub and adapted for contactwith the flange, and a fixed sleeve, of a cam-lever pivoted to thecollar and engaging with the sleeve, and a shifting 'mechanism connectedwith the camlever, as and for the purpose specified.

2. In a deviceot the character described, the combination, with a sleeveprovided with diametrically-opposite lugs and a pulley held to turn uponthe sleeve, the hub of which is provided with an annular ange, of acollar encircling the pulley-hub at one side of the flange and engagingwith the flange, the said collar having a connection with the sleeve, acolla-r also encircling the hub and engaging with the opposite side ofits flange, ashifting device, and a link-connection between the lattercollar and the shifting device, several of the links being provided witha recess to receive the lugs of the sleeve, onewall of said recessesbeing a cam-surface, as and for the purpose specitied.

3. In a device of the character described, the combination,with asleeve, a pulley mounted loosely upon the sleeve, the hub of which -isprovided with an annular flange, and a fixed collar loosely surroundingthe hub, connected with the sleeve and adapted for engagement with oneside of the hub-flange, of a movable collar also encircling the hub and`adapted for engagement with its ange, lugs formed upon the sleeve, ashifting device, and links connecting the shifting device and themovable collar, several of which links are provided with recesses toreceive the lugs of the collar, one side wall of which recessesconstitutes cam-surfaces, as and for the purpose specified.

4. In a device ofthe character described, the combination, with a sleeveprovid ed with diametrical lugs, a pulley mounted' loosely upon thesleeve, thehub of which is provided with an annular flange, and a collaron the hub connected with the sleeve and adapted to engage one side ofthe hub-ange, of a movable collar on the hub adapted for engagement withits flange, cam-levers pivoted on the movable collar and adapted toengage the sleeve-lugs, a shifting device, and links connectingthe'levers and shifting device, as and for the purposes specified.

CLARENCE M. CARHART.

Witnesses:

GEORGE W. GRANT,

JOSEPH H. MITCHELL.

